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Journal Article

BCS-like Density of States in Superconducting A3C60 Surfaces

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Hesper, R., Tjeng, L. H., Heeres, A., & Sawatzky, G. A. (2000). BCS-like Density of States in Superconducting A3C60 Surfaces. Physical Review Letters, 85(9), 1970-1973. doi:10.1103/PhysRevLett.85.1970.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-1E28-0
We report on an ultrahigh resolution photoemission study on the topmost molecular layer of K3C60 and Rb3C60 films below and above the superconducting transition temperature T-C. We observed not only clear evidence for the opening of the superconducting gap, but also a modification in the photoemission line shape consistent with a change from a normal-metallic to a BCS-like density of states, including the formation of a condensation peak. The data can be accurately modeled by a BCS-type function with a gap Delta derived from T-C in the weak-coupling limit (2 Delta/k(B)T(C) = 3.53).